Swift 5.4 UIImage动画：如何从弹跳（UIViewAnimate）切换到拖动（UIPanGestureRecognizer）

Question

我有一个 UIImageView。

我可以使用 animate 让它弹跳：

        self.myImage.frame = CGRect(x: myImage.center.x, y: myImage.center.y, width: 50, height: 70)
        UIView.animate(withDuration: 0.4, delay: 0, options: [.repeat, .autoreverse] , animations: {
            self.myImage.frame = CGRect(x: self.myImage.center.x, y: self.myImage.center.y, width: 70, height: 80);
            }) { (completed) in  }

或者，我可以使用 panGestureRecogniser 拖动它：

    @IBAction func dragView(_ sender: UIPanGestureRecognizer) {
            let translation = sender.translation(in: self.view)
            if let viewToDrag = sender.view {
                viewToDrag.center = CGPoint(x: viewToDrag.center.x + translation.x, y: viewToDrag.center.y + translation.y)
                sender.setTranslation(.zero, in: viewToDrag)
            }

如何从先弹跳切换到拖动？

Answer 1

在设置动画时将 .allowUserInteraction 添加到您的选项中

self.myImage.frame = CGRect(x: myImage.center.x, y: myImage.center.y, width: 50, height: 70)
UIView.animate(withDuration: 0.4, delay: 0, options: [.repeat, .autoreverse, .allowUserInteraction] , animations: {
  self.myImage.frame = CGRect(x: self.myImage.center.x, y: self.myImage.center.y, width: 70, height: 80);
  }) { (completed) in  }

编辑： 要打破弹跳动画循环，请在平移手势的开始状态使用 self.myImage.layer.removeAllAnimations()，如下所示：

@IBAction func dragView(_ sender: UIPanGestureRecognizer) {
            let translation = sender.translation(in: self.view)
            if let viewToDrag = sender.view {
                if sender.state == .began {
                   viewToDrag.layer.removeAllAnimations()
                }
                viewToDrag.center = CGPoint(x: viewToDrag.center.x + translation.x, y: viewToDrag.center.y + translation.y)
                sender.setTranslation(.zero, in: viewToDrag)
            }

Swift 5.4 UIImage动画：如何从弹跳（UIViewAnimate）切换到拖动（UIPanGestureRecognizer）

Swift 5.4 UIImage animation: How to switch from bouncing (UIViewAnimate) to dragging (UIPanGestureRecognizer)

animation

transition

uiimageview

uipangesturerecognizer

swift